copysign(3) -- Linux man page
NAME
copysign, copysignf, copysignl - copy sign of a number
SYNOPSIS
#include <math.h>
double copysign(double x, double y);
float copysignf(float x, float y);
long double copysignl(long double x, long double y);
DESCRIPTION
The copysign() functions return a value whose absolute value matches
that of x, but whose sign matches that of y.
If x is a NaN, then a NaN with the sign of y is returned.
NOTES
The copysign() functions may treat a negative zero as positive.
CONFORMING TO
C99, BSD 4.3.
This function is defined in IEC 559 (and the appendix with
recommended functions in IEEE 754/IEEE 854).
SEE ALSO
signbit(3)
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